US10501057B2 - Parking lock pre-selection system - Google Patents
Parking lock pre-selection system Download PDFInfo
- Publication number
- US10501057B2 US10501057B2 US15/542,342 US201615542342A US10501057B2 US 10501057 B2 US10501057 B2 US 10501057B2 US 201615542342 A US201615542342 A US 201615542342A US 10501057 B2 US10501057 B2 US 10501057B2
- Authority
- US
- United States
- Prior art keywords
- link
- links
- parking lock
- pawl
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/005—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles by locking of wheel or transmission rotation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
- F16D63/006—Positive locking brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/14—Mechanical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H51/00—Levers of gearing mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3425—Parking lock mechanisms or brakes in the transmission characterised by pawls or wheels
- F16H63/3433—Details of latch mechanisms, e.g. for keeping pawls out of engagement
Definitions
- the present invention relates to work machine power trains, and more specifically to parking lock systems for such power trains.
- the power train plays an important role in propelling the work machine at appropriate speeds and providing sufficient torque for work machine movement and additional power requirements such as agricultural processing.
- An important feature of the work machine power train is to have a parking lock which positively locks the power train, and hence the work machine, in place. Typically, this is done by utilizing teeth on one of the power train output shafts and a parking pawl that is moveable into engagement with the teeth to positively lock the work machine in place.
- U.S. Pat. No. 6,250,433 discloses a positive locking parking brake where the brake/lock pin is preferably spring biased towards its extended position, with its spring acting direct on the pin.
- the parking lock pawl is equipped with safety features to prevent engagement while a work machine is moving.
- the parking feature is operator actuated by moving an operator lever into a fixed parking lock position. With a solid link in the mechanism between the operator lever and the parking lock pawl, if the alignment of the shaft is such that the pawl engages the top of a tooth, the operator must move the work machine so that the tooth rotates out of interference with the pawl and permit engagement. This adds additional complexity to the procedure for parking the work machine, since the operator must continue to exert force on the lever engaging the parking lock mechanism.
- the present invention provides a pre-selection parking lock feature that is reliable and simplified.
- the invention is embodied in an operator initiated parking lock actuation system for a work machine in which the parking lock is actuated by displacement of a lever.
- the system includes a first link and a second link pivotally connected to the first link at a point in between the ends of the first and second links, with one end of each link being connected between an operator displacement input and the parking lock lever.
- a spring is interconnected between the first and second link to yieldably urge them to an elongated state and a stop on one of the links limits the elongated state to a length causing displacement of the lever to initiate engagement of the parking lock.
- the invention is a power train for a work machine including a rotatable output shaft having teeth on it and a pawl displaceable into and out of engagement with the teeth to lock the power train.
- the pawl is connected to a lever that responds to an operator input.
- the system includes a first link and a second link pivotally connected to the first link at a point in between the ends of the first and second links, with one end of each link being connected between an operator displacement input and the lever for the parking lock.
- a spring is interconnected between the first and second links to yieldably urge them to an elongated state and a stop on one of the links limits the elongated state to a length that causes the parking lock lever to displace the pawl into engagement with the teeth.
- An advantage of the present invention is a simplified construction for a parking lock pre-selection mechanism.
- Another advantage is less sensitivity to contaminates in the environment.
- FIG. 1 shows the power train of a work machine partially in schematic form and showing a parking lock function as shown in the prior art
- FIG. 2 is a side view of a parking lock pre-selection mechanism embodying the present invention
- FIG. 3 shows the power train of FIG. 1 incorporating the pre-selection mechanism of FIG. 2 in a state where the parking lock is not engaged;
- FIG. 4 shows the pre-selection mechanism of FIG. 2 in a pre-selected state
- FIG. 5 shows the pre-selection mechanism of FIGS. 2 and 3 in the position for parking lock engagement.
- Power train 10 is typically utilized in a work machine (not shown) to provide forward motion for the work machine and also to connect the output of the work machine power unit to agricultural processing equipment.
- the power train 10 may include gear change sets, differentials, clutches, and other mechanical devices to match the RPM of the power unit to the necessary velocity or torque output.
- the power train 10 includes an output shaft 12 journaled at 14 within housing 16 , only a portion of which is shown.
- the shaft 12 may have a gear 18 providing engagement with the additional components of the drive train 10 .
- the shaft 12 has a plurality of teeth 20 extending radially outward at selected locations around its periphery.
- a pawl 22 is mounted on a rocker arm 24 , which in turn, is pivotally mounted at 26 and is displaceable to position pawl 22 so that it interferes with and locks the shaft 12 in place by virtue of the teeth 20 .
- a roller follower 28 on rocker arm 24 interacts with a cam 30 on a cam support shaft 32 that is journaled at 34 .
- the cam 30 has a surface contour in the form of a ramp so that rotation of the cam support shaft 32 in a counter-clockwise direction, as shown in FIG. 1 , urges rocker arm 24 and pawl 22 into engagement with teeth 20 on shaft 12 .
- the end of cam support shaft 32 has a cam support shaft lever 36 to receive a displacement input.
- a spring 38 acts on rocker arm 24 to yieldably urge roller follower 28 against cam 30 .
- a control link 40 formed from a solid rod is pivotally connected to a crank arm 42 which is in turn connected to an actuating cable 44 .
- Actuating cable 44 extends to an operator selection mechanism 46 which incorporates an operator lever 48 for moving the desired condition between the illustrated position in which the parking lock is disengaged and a position 50 in which the parking lock is engaged.
- the solid link 40 presents difficulties in engagement when the position of shaft 12 is such that a tooth 20 abuts the pawl 22 .
- the control link assembly 52 illustrated in FIG. 2 is employed to overcome these deficiencies.
- an improved control link assembly 52 includes a first link 54 pivotally connected to a second link 56 at a pin 58 which forms a pivot between the two. As illustrated, the junction between the first and second links is in between their ends.
- One end of link 54 has a forked section 62 through which a pin 60 connects the control link assembly 52 to the bell crank 42 as shown in FIG. 3 .
- a pin 64 extends through a forked section 62 of link 56 to provide a connection to the cam support shaft lever 36 .
- links 54 and 56 interconnect the crank arm 42 and cam support shaft lever 36 .
- Link 54 has a generally straight section 68 and a curved section 76 so that the pin 64 on the forked section 66 generally is in alignment with the straight section 68 .
- An adjustable stop 72 on one end of link 56 sets the maximum distance between pins 64 and 60 and thus the overall length of the control link assembly 52 .
- the adjustable stop 72 is a threaded screw with an appropriate lock nut to set the adjusted position.
- a spring 74 connects with a hole 76 in link 56 and with a tab with a notch 78 on the first link to urge the links 56 and 54 to a relative position in which they are in the maximum length position as set by stop 72 .
- control link assembly 52 can be explained by reference to FIGS. 3-5 .
- the operator lever 48 of FIG. 1 is in a non-parking lock position and the crank arm 42 assumes the position shown by reference line 80 .
- the pawl 22 is clear of the teeth 20 and the power train 10 can function in a normal fashion.
- lever 48 is moved to the parking lock position shown by line 50 , which pulls crank arm 42 downward to the pre-selection position illustrated by reference line 82 in FIG. 4 .
- the spring 74 permits the links 54 and 56 to pivot relative to one another that the displacement of the first link 54 is not reflected in movement of the cam support shaft lever 36 .
- the operator has already locked the selection lever 48 in position 50 so that no further active manipulation need take place.
- the shaft 12 can rotate so that the pawl 22 is clear of a tooth 20 .
- the spring 74 pulls to urge the links 54 and 56 to their maximum position set by the adjustable stop 72 to pivot crank cam support shaft lever 36 to the position shown in FIG. 5 in which the cam surface 30 moves to urge the pawl 22 into the space between adjacent teeth 20 .
- the pawl 22 and teeth 20 provide an effective lock against movement of the work machine.
- the strength of the spring 74 is selected so that when a pawl 22 is clear of a tooth 20 the spring will overcome any frictional forces within the system.
- the above arrangement provides a highly effective and simplified parking lock pre-selection system for the power train of a work machine.
- the joints are pivoting rather than sliding joints so as to minimize the frictional interconnection.
- the links 54 and 56 can be formed from inexpensive stampings and easily connected with the pins in the parking lock control mechanism, thus reducing the cost of manufacture. With such an arrangement, the operator need not continually press on the operator lever 48 to allow the pawl 22 to move into engagement.
Abstract
Description
Claims (9)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMO2015A000001 | 2015-01-07 | ||
ITMO20150001 | 2015-01-07 | ||
ITMO2015A0001 | 2015-01-07 | ||
PCT/EP2016/050127 WO2016110507A1 (en) | 2015-01-07 | 2016-01-06 | Parking lock pre-selection system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180273002A1 US20180273002A1 (en) | 2018-09-27 |
US10501057B2 true US10501057B2 (en) | 2019-12-10 |
Family
ID=52633447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/542,342 Active 2036-08-09 US10501057B2 (en) | 2015-01-07 | 2016-01-06 | Parking lock pre-selection system |
Country Status (5)
Country | Link |
---|---|
US (1) | US10501057B2 (en) |
EP (1) | EP3242820B1 (en) |
CN (1) | CN107107881B (en) |
BR (1) | BR112017014470B1 (en) |
WO (1) | WO2016110507A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7360393B2 (en) * | 2018-04-11 | 2023-10-12 | リナマー・コーポレーション | parking lock rod assembly |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2964135A (en) * | 1957-08-19 | 1960-12-13 | Gen Motors Corp | Brake mechanism |
US3710904A (en) * | 1971-12-16 | 1973-01-16 | Caterpillar Tractor Co | Brake and transmission shift locks with single control lever |
US3856119A (en) * | 1973-07-23 | 1974-12-24 | Gen Motors Corp | Transmission brake mechanism |
US4369867A (en) | 1980-09-11 | 1983-01-25 | Ford Motor Company | Automatic transmission parking brake mechanism |
US4585103A (en) | 1982-05-28 | 1986-04-29 | Aisin-Warner K.K. | Automatic transmission locking mechanism for parking |
US6250433B1 (en) | 1999-05-24 | 2001-06-26 | Case Corporation | Positive-locking vehicular parking brake |
US20110005891A1 (en) * | 2009-07-13 | 2011-01-13 | Mazda Motor Corporation | Parking device of transmission |
US20150027846A1 (en) * | 2013-07-23 | 2015-01-29 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Parking lock arrangement and motor vehicle transmission |
US20160208916A1 (en) * | 2013-10-23 | 2016-07-21 | Aisin Aw Co., Ltd. | Parking device |
US20170292605A1 (en) * | 2016-04-08 | 2017-10-12 | Honda Motor Co.,Ltd. | Electronic parking lock apparatus |
US20190049005A1 (en) * | 2017-08-11 | 2019-02-14 | Electricfil Corporation | Park pawl engagement and sensor assembly and method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5295412A (en) * | 1993-07-09 | 1994-03-22 | Chrysler Corporation | Park locking mechanism |
DE102008000857A1 (en) * | 2008-03-27 | 2009-10-01 | Zf Friedrichshafen Ag | Parking lock system for an automatic transmission |
CN201944250U (en) * | 2010-01-07 | 2011-08-24 | 浙江吉利汽车研究院有限公司 | Improved parking braking device |
-
2016
- 2016-01-06 WO PCT/EP2016/050127 patent/WO2016110507A1/en active Application Filing
- 2016-01-06 CN CN201680005189.0A patent/CN107107881B/en active Active
- 2016-01-06 EP EP16700950.5A patent/EP3242820B1/en active Active
- 2016-01-06 BR BR112017014470-0A patent/BR112017014470B1/en active IP Right Grant
- 2016-01-06 US US15/542,342 patent/US10501057B2/en active Active
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2964135A (en) * | 1957-08-19 | 1960-12-13 | Gen Motors Corp | Brake mechanism |
US3710904A (en) * | 1971-12-16 | 1973-01-16 | Caterpillar Tractor Co | Brake and transmission shift locks with single control lever |
US3856119A (en) * | 1973-07-23 | 1974-12-24 | Gen Motors Corp | Transmission brake mechanism |
US4369867A (en) | 1980-09-11 | 1983-01-25 | Ford Motor Company | Automatic transmission parking brake mechanism |
US4585103A (en) | 1982-05-28 | 1986-04-29 | Aisin-Warner K.K. | Automatic transmission locking mechanism for parking |
US6250433B1 (en) | 1999-05-24 | 2001-06-26 | Case Corporation | Positive-locking vehicular parking brake |
US20110005891A1 (en) * | 2009-07-13 | 2011-01-13 | Mazda Motor Corporation | Parking device of transmission |
US8240448B2 (en) * | 2009-07-13 | 2012-08-14 | Mazda Motor Corporation | Parking device of transmission |
US20150027846A1 (en) * | 2013-07-23 | 2015-01-29 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Parking lock arrangement and motor vehicle transmission |
US9440625B2 (en) * | 2013-07-23 | 2016-09-13 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Parking lock arrangement and motor vehicle transmission |
US20160208916A1 (en) * | 2013-10-23 | 2016-07-21 | Aisin Aw Co., Ltd. | Parking device |
US20170292605A1 (en) * | 2016-04-08 | 2017-10-12 | Honda Motor Co.,Ltd. | Electronic parking lock apparatus |
US10161519B2 (en) * | 2016-04-08 | 2018-12-25 | Honda Motor Co., Ltd. | Electronic parking lock apparatus |
US20190049005A1 (en) * | 2017-08-11 | 2019-02-14 | Electricfil Corporation | Park pawl engagement and sensor assembly and method |
Non-Patent Citations (1)
Title |
---|
Search Report and Opinion for PCT Application No. PCT/EP2016/050127 dated Jun. 7, 2016 (9 pages). |
Also Published As
Publication number | Publication date |
---|---|
CN107107881A (en) | 2017-08-29 |
WO2016110507A1 (en) | 2016-07-14 |
EP3242820B1 (en) | 2018-12-12 |
BR112017014470B1 (en) | 2022-08-23 |
EP3242820A1 (en) | 2017-11-15 |
US20180273002A1 (en) | 2018-09-27 |
BR112017014470A2 (en) | 2018-01-16 |
CN107107881B (en) | 2020-08-11 |
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